Compare two libraries to find exclusive items
Does anyone have a script to compare two libraries and list items existing in one but missing in other? I want to compare one of my group libraries to My Library. The group libraries has a half-dozen more items than My Library and I would like to know which items are in my Group library but missing in My Library. I probably deleted these items from My Library and would like to delete them from the Group Library, too.
@danstillman provided a script in a different post that identified items that had a one-to-many relationship, and that helped a lot.
I was wondering if that script or a similar script can find instances of one-to-none relationship (that is, an item in a group that has no counterpart in My Library)? Important point: all the items in the group are created by drag-drop from My Library.